#include <stdio.h>

/*阶乘尾数零的个数*/
void main()
{
    int a,count=0;
    for(a=5;a<=100;a+=5)
    {
        count++;
        if(!(a%25)) count++;
    }
    printf("The number of 0 in the end of 100 is:%d.\n",count);

}